1 /*
2 * Bus Glue for Atheros AR7XXX/AR9XXX built-in EHCI controller.
3 *
4 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6 *
7 * Parts of this file are based on Atheros' 2.6.15 BSP
8 * Copyright (C) 2007 Atheros Communications, Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 */
14
15 #include <linux/platform_device.h>
16
17 enum {
18 EHCI_ATH79_IP_V1 = 0,
19 EHCI_ATH79_IP_V2,
20 };
21
22 static const struct platform_device_id ehci_ath79_id_table[] = {
23 {
24 .name = "ar71xx-ehci",
25 .driver_data = EHCI_ATH79_IP_V1,
26 },
27 {
28 .name = "ar724x-ehci",
29 .driver_data = EHCI_ATH79_IP_V2,
30 },
31 {
32 .name = "ar913x-ehci",
33 .driver_data = EHCI_ATH79_IP_V2,
34 },
35 {
36 .name = "ar933x-ehci",
37 .driver_data = EHCI_ATH79_IP_V2,
38 },
39 {
40 /* terminating entry */
41 },
42 };
43
44 MODULE_DEVICE_TABLE(platform, ehci_ath79_id_table);
45
ehci_ath79_init(struct usb_hcd * hcd)46 static int ehci_ath79_init(struct usb_hcd *hcd)
47 {
48 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
49 struct platform_device *pdev = to_platform_device(hcd->self.controller);
50 const struct platform_device_id *id;
51 int ret;
52
53 id = platform_get_device_id(pdev);
54 if (!id) {
55 dev_err(hcd->self.controller, "missing device id\n");
56 return -EINVAL;
57 }
58
59 switch (id->driver_data) {
60 case EHCI_ATH79_IP_V1:
61 ehci->has_synopsys_hc_bug = 1;
62
63 ehci->caps = hcd->regs;
64 ehci->regs = hcd->regs +
65 HC_LENGTH(ehci,
66 ehci_readl(ehci, &ehci->caps->hc_capbase));
67 break;
68
69 case EHCI_ATH79_IP_V2:
70 hcd->has_tt = 1;
71
72 ehci->caps = hcd->regs + 0x100;
73 ehci->regs = hcd->regs + 0x100 +
74 HC_LENGTH(ehci,
75 ehci_readl(ehci, &ehci->caps->hc_capbase));
76 break;
77
78 default:
79 BUG();
80 }
81
82 dbg_hcs_params(ehci, "reset");
83 dbg_hcc_params(ehci, "reset");
84 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
85 ehci->sbrn = 0x20;
86
87 ehci_reset(ehci);
88
89 ret = ehci_init(hcd);
90 if (ret)
91 return ret;
92
93 ehci_port_power(ehci, 0);
94
95 return 0;
96 }
97
98 static const struct hc_driver ehci_ath79_hc_driver = {
99 .description = hcd_name,
100 .product_desc = "Atheros built-in EHCI controller",
101 .hcd_priv_size = sizeof(struct ehci_hcd),
102 .irq = ehci_irq,
103 .flags = HCD_MEMORY | HCD_USB2,
104
105 .reset = ehci_ath79_init,
106 .start = ehci_run,
107 .stop = ehci_stop,
108 .shutdown = ehci_shutdown,
109
110 .urb_enqueue = ehci_urb_enqueue,
111 .urb_dequeue = ehci_urb_dequeue,
112 .endpoint_disable = ehci_endpoint_disable,
113 .endpoint_reset = ehci_endpoint_reset,
114
115 .get_frame_number = ehci_get_frame,
116
117 .hub_status_data = ehci_hub_status_data,
118 .hub_control = ehci_hub_control,
119
120 .relinquish_port = ehci_relinquish_port,
121 .port_handed_over = ehci_port_handed_over,
122
123 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
124 };
125
ehci_ath79_probe(struct platform_device * pdev)126 static int ehci_ath79_probe(struct platform_device *pdev)
127 {
128 struct usb_hcd *hcd;
129 struct resource *res;
130 int irq;
131 int ret;
132
133 if (usb_disabled())
134 return -ENODEV;
135
136 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
137 if (!res) {
138 dev_dbg(&pdev->dev, "no IRQ specified\n");
139 return -ENODEV;
140 }
141 irq = res->start;
142
143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144 if (!res) {
145 dev_dbg(&pdev->dev, "no base address specified\n");
146 return -ENODEV;
147 }
148
149 hcd = usb_create_hcd(&ehci_ath79_hc_driver, &pdev->dev,
150 dev_name(&pdev->dev));
151 if (!hcd)
152 return -ENOMEM;
153
154 hcd->rsrc_start = res->start;
155 hcd->rsrc_len = resource_size(res);
156
157 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
158 dev_dbg(&pdev->dev, "controller already in use\n");
159 ret = -EBUSY;
160 goto err_put_hcd;
161 }
162
163 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
164 if (!hcd->regs) {
165 dev_dbg(&pdev->dev, "error mapping memory\n");
166 ret = -EFAULT;
167 goto err_release_region;
168 }
169
170 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
171 if (ret)
172 goto err_iounmap;
173
174 return 0;
175
176 err_iounmap:
177 iounmap(hcd->regs);
178
179 err_release_region:
180 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
181 err_put_hcd:
182 usb_put_hcd(hcd);
183 return ret;
184 }
185
ehci_ath79_remove(struct platform_device * pdev)186 static int ehci_ath79_remove(struct platform_device *pdev)
187 {
188 struct usb_hcd *hcd = platform_get_drvdata(pdev);
189
190 usb_remove_hcd(hcd);
191 iounmap(hcd->regs);
192 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
193 usb_put_hcd(hcd);
194
195 return 0;
196 }
197
198 static struct platform_driver ehci_ath79_driver = {
199 .probe = ehci_ath79_probe,
200 .remove = ehci_ath79_remove,
201 .id_table = ehci_ath79_id_table,
202 .driver = {
203 .owner = THIS_MODULE,
204 .name = "ath79-ehci",
205 }
206 };
207
208 MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ath79-ehci");
209